حَدَّثَنَا ابْنُ الْمُثَنَّى، حَدَّثَنَا ابْنُ أَبِي عَدِيٍّ، عَنْ حَنْظَلَةَ، عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ، عَنْ عَائِشَةَ، قَالَتْ ‏:‏ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُصَلِّي مِنَ اللَّيْلِ عَشْرَ رَكَعَاتٍ، وَيُوتِرُ بِسَجْدَةٍ، وَيَسْجُدُ سَجْدَتَىِ الْفَجْرِ، فَذَلِكَ ثَلاَثَ عَشْرَةَ رَكْعَةً ‏.‏
Translation
Narrated Ibn 'Abbas

I spent a night with my maternal aunt Maimunah. The Messenger of Allah (ﷺ) came after the evening has come. He asked: Did the boy pray ? She said: Yes. Then he lay down till a part of night had passed as much as Allah willed; he got up, performed ablution and prayed seven or five rak'ahs, observing witr with them. He uttered the salutation only in the last of them.